package jdbc;

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class exportscore
 */
@WebServlet("/src/exportscore")
public class exportscore extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public exportscore() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.getWriter().append("Served at: ").append(request.getContextPath());
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		response.setHeader("Access-Control-Allow-Origin", "*");//模板
	    response.setHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE");//模板
	    response.setHeader("Access-Control-Allow-Headers", "Content-Type");//模板
	    //设置编码格式
	    request.setCharacterEncoding("UTF-8");//模板
	    response.setCharacterEncoding("UTF-8");//模板
		
	    String teacher_id = request.getParameter("teacher_id");
	    //int id = Integer.parseInt(student_id);
	    
	    hello a = new hello();//模板
	    try {//模板
			ResultSet b;
			
			    
				b = a.doselect("SELECT c.course_name, s.student_name, sc.score, s.student_id, c.course_id  "
						+ "from course c "
						+ "JOIN sc ON c.course_id = sc.course_id "
						+ "JOIN student s ON s.student_id = sc.student_id "
						+ "where c.course_teacher= ? ",teacher_id);
						
						//+ "ORDER BY sc.course_id"
			
			while(b.next()) {//b代表查询结果，查询之后的那个表，next（）函数就是往下一行，逐行扫描
				response.getWriter().write(b.getString("course_name")+";");//这里表示的是往返回的那个response里面添加字符串，修改write括号后的内容即可
				response.getWriter().write(b.getString("student_name")+";");
				response.getWriter().write(b.getString("score")+";");
				
				//response.getWriter().write(b.getString("selected")+";");
			}//模板
			b.close();
		
		} catch (SQLException e) {//模板
			e.printStackTrace();//模板
		}//模板
	}

}
